MUNRO Medical Centre formally opened the just over £1m extension to the practice at a gathering on Wednesday.
Over the past four to five years the patient list has grown by more than 3,000 people and staff were working in cramped conditions, forced to use examination rooms for consultations.
However, the extension has added seven consulting rooms, two examination rooms, a waiting area, a lift to first-floor administration offices and a separate staff car park, part of the conditions of planning.
Patients have been using the extension since November but the practice took the opportunity to bring together those involved in the project for a lunch and an official opening.
Guests included contractor David Coles of Mowbray & Son of Swineshead and archictect John Conner from Heckington as well as members of the Primary Care Trust.
Senior partner Dr Charles Lennon said the extension had allowed the practice to take on two new part-time doctors and three or four additional nurses.
Munro Medical Centre had also expanded the number of training places for registrars from two to four, one of the conditions of funding from the East Midland Deanery, the body that supervises training.
Dr Lennon said: “We were very over-crowded before the extension and using rooms that were meant to be examination rooms as consulting rooms.
“We had taken on extra staff but were having to cram them into the existing space.”